After dying suddenly from overwork, Chen Mo transmigrated to ancient times, and right at the start, he was chosen as a matrilocal son-in-law by Miss Shen of the richest family in Jiangnan. Everyone was waiting to make a joke out of him—a poor fellow with an unknown background, how could he dare challenge Suzhou City? With a counter-turn, he made soap, developed dyes, led Shen Qingyi to secure the imperial merchant qualification, and built the Chen Family Firm from a small shop into a mercantile guild spanning across Jiangnan. Suppressed by the prefect, tripped up by love rivals, and sabotaged by competitors, he slapped them back one by one. Until he discovered that his transmigration, the origin of the system, and the secret of Shen's grandfather four hundred years ago all pointed to the same answer. And that answer is right beneath Taihu Lake.